Wood-carving machine.



Y 1. GALBRAITH.

WOOD CARVING MACHINE. APPLICATION FILED MAY 1o. |910.

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A TOR/VE L GALBRAITH.

WOOD CARVING MACHINE. APPLICATION FILED MAY10. 1916.

Patelld J 1111 5, 1917.'

4 SHEETS-SHEET 2.

N m m l n /m uw* Nw @NWI I. GALBRAITH.

WOOD CARVING MACHINE.

APPLICATION FILED MAY l0. I9I6.

1,229,059. Patented June 5, 1917.

4 SHEETS-SHEET 3.

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J. GALBHAITH.

WOOD CARVING MACHINE.

APPLICATION FlLED MAY 10. 1916.

1,229,059, Patented. June 5, 191?.

4 SHEETS-#SHEET 4.

WITNESS.'

JOHN GALBRAITH, 0F SVATARA,

MINNESOTA, ASSIGNOR 0F ONE-HALF TO FRANK J'.

WIDIVIAN, OF CHICAGO, ILLINOIS.

W0 OD-CARVIN G MACHINE.

Specification of Letters Patent.

Patented J une 5, 1917.

Application led. May 10, 1916. Serial No. 96,664.

provided a tracing point or the like which can be moved in any desired direction back and forth over the surface of the model, the tracing point also rising and falling according to the irregularities or changes in elevation of the different portions of the surface of the model, and thereV is also provided one or more carving tools which simultaneously follow the movements of the tracing point. The movements of the carving tools may be of equal magnitude with the movements of the tracing point, in which case the replica or replicas will be of the same size as the model., or there may be either a magnification or diminution of size of the replica as compared to that of the model.

In order that machines of this type may be entirely satisfactory for the purpose intended, they should be so constructed that very delicate or slight changes in the position of the tracing point, either horizontally or vertically, will be accurately transmitted to the carving tool or tools. Furthermore, such machines should be very delicately balanced in order that they may be properly manipulated by the operator without jerking or violent iiuctuations.

One of the objects of the present invention is to so construct the mechanism of the carving machine to very accurately reproduce the movements of the tracing point in the movements of the carving tools, while at the same time providing a machine of great strength and permanency.

l-lnother object of the invention is to so construct the machine that the same -will be maintained in balance at all positions of the tracing point and carving tools within all tions 10, which are reasonable ranges of movement of these parts during the carving operation.

Another object of the invention is to pro-i vide a machine of Very simple construction and one which can be manufactured and assembled at a comparatively small cost. In

this connection another object is to so construct the machine that all of the movements may .be secured with a ininimumnumi ber of links and moving parts.

Other objects and uses of the invention will appear from a detailed description of the same, which consists in the features of construction and combinations of parts hereinafter described and claimed.

Referring to the drawings:

Figure l shows a front elevation of the 'assembled machine;

Fig. 2 shows a side elevation of the assembled machine;

Fig. 3 shows a plan view corresponding to Figs. l and 2;

Fig. i shows a fragmentary side elevation of the upper operating portion of the machine, the tracing point and carving tools being moved backwardly and upwardly from the position shown in Fig. 2;

Fig. 5 shows a fragmentary plan view corresponding to Fig. Ll; and

Fig. 6 shows a fragmentary verticalcrosssection taken on the line 6 6 of Fig. 2, looking in the direction of the arrows.

In the several figures I have shown the featuresof my invention as beingy incorporated within a machine having a iiXed table for the support of the model and the replicas, but I desire to state at this point that said features are in no wise limited to use in connection with lsuch a table, inasmuch as any other suitable support for these parts might be substituted for such table.

Referring now to the several figures, the machine is shown as being supported by a frame-work including the side brackets 7 and 8 and the cross rods 9. Connected. to the brackets 7 and 8 are the lugs or projecmounted in pairs standing in vertical alinement. Extending through the lugs l0 at each corner of the machine is a vertically adjustable post 11,

the posts at each side of the machine carrylike 12. The table proper comprises a series of cross slats 13 mounted upon the rails 12, to which slats may be bolted or otherwise secured the model and the replicas.

Each of the posts 11 has its lower portion threaded, and a sprocket wheel or the like 14 is threaded on each of said posts and rests against Vthe lowermost lug 10, through which saidr post extends. A cha-in 15 completely encircles the frame, said chain riding on all of the sprocket wheels at the four corners. By pulling the kchain in the one direction or the other, the table may be raised or lowered tok secure verticaladjustment.

At each side of the machine is an upstanding bracket 16, these two Vbrackets together serving to carry the operative. mechanism.

- The brackets are conveniently joined together in their upper forward portions by a pair of crosswise yextending tubes 17 and 18, which tubes are clamped to thebrackets. Such clamping is conveniently effected by means of a removable cap 19, on each of the brackets. Another crosswise vextending' bar or the like 20jpreferably connects together the rear upper portions of the brackets and serves as a convenient mounting yfor certain of the operative elements.

Downwardly depending from the central portions of the tubes 17 and 18 is a bracket 21 which is rigidly connectedy to said tubes. The lower end of this bracket 21 is inturned to provide a journal 22 in verticalV alinement with another journal 23, also carried by said bracket 21. A vertical shaft` 24 is mounted in the bearings 22 and 23. The shaft 24 serves as a convenient center for the support of certain of the operating` elements of the machine.

Swingingly mounted on the shaft 24 are the sidewise extending yokes 25 and 26, best shown in Fig. 1. Each of these yokesy has its inner end bifurcated and swung on the so that the outer ends of said yokes may be swung back and forth. The yokes are supported by the lower bearing 22 of the bracket 21, by which bearing' they are prevented from dropping off from the lower end of the shaft.

Swiveled on the outer ends of the yokes shaft,

` 25 and 26 are the universal brackets 27 and 28 respectively. Each of these universal brackets comprises a vertical member 29 having the forwardly extending upper and lower arms 30 and 31 respectively, and the forwardly extending` central arm 32. Sidewise projecting from the central arm 32 is the boss 33. The bosses: of the universal brackets 27 and 28 are swiveled to the end portions of the respective vokes 25 and 26 by means of the studs 34. It, therefore, follows that each of the universal brackets may have a rocking motion on its stud with respect to the'corresponding yoke, but that each universal bracket yis compelled at all ywithin the same vertical plane extending longitudinally of themachine. For this purpose I have shown a pair of downwardly depending arms36, the upper ends of said arms being connected to a bracket k37which is carriedy by the cross pin 20, but cannot move sidewise across the machine. rlhe lower portion of each arm 36 is' thus caused to swing within a plane surface. Connected to the lower endsv of the arms 36 are the forwardly ,extending arms 38. The arms 36 and 38 are connected together bythe brack- ,ets 39` and 40, and the front ends of the arms 38 kare connected to the floating bar 35 by the brackets 41.v Consequentlyv the floating bar cannot move llaterally or sidewise without distorting the arms 36 and 38. The floating bar can, however, move back and forth and up and down in the manner previously described.

Extending between the universal brackets 28 and 29 and the floating bar are the bi- V furcated yokes 42 and 43 respectively. yThe forward. end of each of these yokes has the kforwardly extending arms 44 and 45, which embrace the corresponding universal bracket, and the rear end of each bifurcated yoke is pivoted toy the floating bar by means of a pin 46. `The pins 47 and 47a serve as pivotal bracket. and the corresponding bifurcated yoke.' Each' of these pins has its inner end provided with aV bearingy for a .shaft 47"J which extends through the arm 32 of the corresponding universal bracket. lt, therefore, follows that duringthe back and forth movements of the floating bar each bifurcated yoke is enabled to swing with respect to the corresponding universal bracket while permitting the said universal bracket to maintain its position of right 'angularity with respect to the corresponding yoke 25 or 26.

.Forwardly extending from the floating bar are the brackets 48 and 49, said brackets having their rear endsv rigid with respect to the floating bar. Swiveled onto the forward end of the brackets 48 and 49 are the bifurcated arms 5() and 51 respectively, said arms vbeing vswiveled to their respective brackets connections between each universal y 54, which carries the tracing point and the carving tools. The end portions of this control bar are connected to the bifurcated arms 50 and 5l, said connections being a fixed distance apart equal to the distance between the rear ends of said bifurcated arms. vConsequently, the control bar may be moved laterally, the bifurcated arms 50 and 5l swinging on their pivotal points 52 and 53 without any movement of the brackets 48 and 49. On the other hand, the back and forth movement of the control bar will serve to cause the floating bar to move back and forth synchronously.

The studs 34 by which the universal brackets are connected to the yokes 25 and 26 serve as centers about which the control bar may be raised and lowered with a swinging motion. If the control bar be raised, the floating bar will be forced downwardly, both of these parts moving in arcuate fashion with respect to the studs 34. By reason of the interposition of the universal brackets between the bifurcated yokes 42 and 43 and the yokes 25 and 26, it follows that the control bar may be raised and lowered in the foregoingl manner regardless of its position longitudinally of the machine.

Inasmuch as the bifurcated arms 50 and 5l and the control bar extend forwardly with respect to the studs 34, while the remaining mechanisms lie to the rear of Said studs, it follows that there will be a counterbalancing action. Ordinarily this will tend to cause all of the parts to float during their K movements.A so that the control bar may be manipulated by the operator with a minimum exertion. Ordinarily it is desirable to cause the bifurcated arma' and control bar to slightly overbalance the other mechanisms, so that there will be a slight tendency for the control bar to fall. In order to secure a very nice adjustment of balance, a pin 55 may be extended rearwardly with respect to the floating bar, and a counter-balance 56 may be slidingly mounted on said pin so as to permit the securing of very nice adjustments of balance. I

The tracing point 57 is conveniently mounted on the central portion of the control bar. At suitable points within the length of the control bar are the carving tools 58. In the construction illustrated I have shown four of said carving tools, although manifestly a greater or lesser number may be adopted as desired. Each of the carving tools comprises a bit of well known construction driven. at high speed, and I do not here concern myself particularly with the construction of these tools. `Suffice it to say atthis point that the tools are to be driven at high speed and that their lower cutting ends should preferably lie in exact alinement withthe lower end of the tracing point.

In order to permit the tracing point and carving tools to be thrown into different positions I have shown the control bar as being pivoted to the forward ends of the bifurcated arms 50 and 51 by means ofthe pins 59 and 60. This construction permits the control bar to be rotated about a hori- Zontal axis.

Any suitable means may be adopted for driving the carving tools at the desired speed. For example, independent driving motors or the like might be used for this purpose. I have, however, illustrated a single motor for driving all of the carving tools from a center point.v For this purpose I have shown the motor 61 as being mounted on the upper end of the shaft 24 and driving said shaft. The said shaft carries the pulleys 62 and 63 at points intermethrough the shafts 47b carries a pulley 69 driving' a forwardly extending belt 7()` The belts 70 extend around the pulleys 68 of two of the carving tools, so that each of the pulleys 69 drives two of said-tools. A slack take-up device 7l is provided for each of the belts 70, said take-up device including a bell crank having a pair of pulleys 72 and 73 working on opposite sides of the belt, a spring 74 tending to tilt the bell crank so as to keep the belt under tension at all times.

Inasmuch as the shafts 47b always maintain a fixed distance from the driving shaft 24 it follows that the belts 66 and 67 will always remain under tension no matter what ioo the position of the control. bar may be.-y

Therefore, by maintaining the belts 70 always under tension it follows that power' will always be transmitted simultaneously to all of the carving tools in all positions of the control bar. I Y

It will be observed from a study of the herein disclosedconstructions that during all of the movements of the control bar 54, said bar is'compelled to lie in the same direction, so that it always maintains a posi-iy tion of parallelism with respect to its previous positions.. This result follows by reason of the fact that the pivotal points 52 and 53 are separated such a distance from each other that the bifurcated arms 50 and 5l always maintain a condition of parallelism. It will also be observed that in the raising and lowering of the control bar, the same swings about an axis extending through the ile studs 34. Inasmuch as the universal brack` Y ets 27 4and 28 are enabled to rock on the said the forward end of each of said brackets, aj Acontrol bar pivotally connected to the forp poi-nton the control bar, a suitable carving Y les extending yokes,

studs, the control bar about the said axis takes place regardless of the exact position of the control bar in a direction back and forth along themachine. Furthermore, the counter-balancing effect is also present atA all l times andalways to an equal degree.

While I have herein shown and described only a single embodiment of my invention, still it will be understood tliatI do not. in anywise limit myself to the saidembodiment, except as I may do so in the claims.

I claim:

1. In a carving machine, the combination with a suitable framework, .of ya verticallyk extending axial member connected to the same, a pair of sidewise extending yokes on the same, a universal bracket swiveled on' the end portion of each of said yokes, a floating bar, abifurcated yoke on each universal bracket, a pivotal connection between the rear end of each bifurcated yoke and the floating bar, a pivotal connection between the front end of each bifurcated yoke and the` corresponding universal bracket, meansy for retaining the floating bar against lateral displacement while permitting each portion of said bar to move freelv in a vertical plane, a pair of forwardly extending brackets having their rear ,ends rigidly connected to the floating bar, a bifurcated arm swiveled on tremity of each sidewise extending yoke, a

floating bar lying to the rearof the sidewise having their rear ends pivoted tothe floating bar and their forward4 ends pivoted to the universal brackets, a forwardly `extending bracket on each side of the machine, eachrof said brackets having its rearend rigidly connected to the floating bar, a bifurcated arm pivotally connected tothe forward end of each of said brackets, said bifurcated arms lying parallel to each other, a control bar pivotally connectedfto the forward ends of the bifurcated arms, a tracing tool on the control bar, and means for driving said carving tool in any position of the control bar, for the purpose specified.

3. In a carving machine,.the `combination it follows that the said swiveling of` a pair of bifurcated yokes with a siiitableframework, of a vertically extendingy axial member carried by the framework, a pair of sidewise extending yokes swiveled on said axial member, a universal bracket swiveled on the outer end of each of said yokes, -a floating bar lying to therear of said yokes, a bifurcated yoke in each sidey of the machine, each bifurcated yoke having its rearend pivoted to the floating bar and its forward end pivoted to the correspondinguniversal bracket, av pair of yforwardly extending brackets having their rear ends yrigidly connected to the floating bar, a pair of bifurcated arms having.v their rear ends pivoted tothe ,forward ends of the said brackets, the said bifurcated arms always lying parallel to each other, a control bar pivotally connected to the forwardends of the bifurcated arms, an adjustable counter-balance on the floating bar, a tracing point. on thecontrol bar, a suitable carving tool on the control bar, and means for driving said carving-'tool in any adjustedposi- `tion of the controlbar, for .the purpose specified.

l. In a carving,machine, the combination with a suitableframework, of a` vertically extendingaxial.. `member v:carried byk the framework, a,pair. of sidewise extending members pivotallymounted on ksaid axial A member, a universalv bracket on the outer end of each of said sidewiseextending members, a floating bar to the rear of thesidewise extending members, a link connection from each universal bracket to the floating bar, a forwardly extending member in each side of the machine,.each of said forwardly extending members having its rear end rigidly connected to the floating bar, a bifurcated member corresponding to each of c the said forwardly extending -members, a

pivotal ,connection between each bifurcated member and the corresponding forwardly extending memberthe forwardly extending members lying parallel to` each other, a control bar, pivotal connections from. the control bar to the bifurcated members, a tracing point on the control bar, a suitable carving tool on the control bar,and.means for drivingcsaid carving tool in any adjusted position of the control bar, for thepurpose specified. y

5. In a vearvingmachine,*the combination with a suitable framework, of a .vertically extending axial member, a pair of sidewise extending members pivoted to said axial member, a floating bar lying to the rear of the sidewise. extendingmembers, a pair of bifurcated yokes, a pivotalY connection between each bifurcated yokeandfthe floating bar, ay universal .connection between each iio bifurcated yoke and the vcorresponding sidewise extending. member, a forwardly extending member in .each rvside ofthe machine, a

rigid connection between each forwardly ex-v tending member and the floating bar, a bifurcated arm in each side of the machine, a pivotal connection between each bifurcated arm and the corresponding forwardly extending member, a control bar, a pivotal connection between each bifurcated arm and the control bar, a tracing point on the control bar, a suitable carving tool on the control bar, and means for driving said carving tool in any adjusted position of the control bar, for the purpose specified.

(E. ln a carving machine', the combination with suitable framework, of a` vertically extending' axial member, a pairof sidewise extending' members pivoted on said 4axial member, a floating bar to the rear of said sidcwise extending members, a universal connection between the floating bar and each sidewise extending member, a forwardly ex- 'tending member in each side of' the machine, a rigid connection between each forwardly extending member 'and the floating bar, a bifurcated arm in each side of the machine, a pivotal connection between each bifurcated arm and the corresponding forwardly extending'member, a'control bar, a pivotal connection Jfrom the control bar to each bifurcated arm, a tracing point on the control. bar, a suitable carving tool on the con-v trol bar, and means for driving said carving tool in any adjusted position of the control bar, for the purpose specified.

7. In a carving machine, the combination with a suitable framework, of a vertically extending axial member, a pair of sidewise extending members swiveled on said axial member, a floatingI bar lying' to the rear lof the sidewise extending members, a universal connection between the floating bar and each sidewise extending member, means for retaining the floating bar against lateral displacement while permitting each point of said bar to move freely within a vertical plane, a forwardly extending member in each side of the machine, a rigid connection between the rear end of each of said members and the floating bar, a bifurcated arm in each side of the machine, a pivotal connection between each bifurcated arm and the corresponding forwardly extending member, a control bar, a pivotal connection between the control bar and each of the bifurcated arms, an adjustable counter-bal ance on the floating bar, a tracing point on the control. bar, a suitable carving tool on the control bar, and means for driving said carving tool in any adjusted position of the control bar, for the purpose specified.

8. In a carving machine, the combination with a suitable framework, of a vertically extending axial member, a -pair of sidewise extending members pivotally mounted on said axial member, a floating bar lying to f the rear of the sidewise extending members,

a universal connection between the floating' bar and each sidewise extending member, a control bar in the' forward portion of the machine, a swiveled connection between each end of the control bar and the floating bar, an adjustable counter-balance on the floating bar, a tracing point on the control bar, a suitable carving tool on the control bar, and means for driving said carving tool in any adjusted position of the control bar, for the purpose specified. i Y

In a carving' machine, the combination with'a suitable framework, of a pair ofsidewise extending members, a pivotal connection between each sidewise extending member and the framework, whereby each of said members is permitted to swing about a vertical axis, a floating bar lying to the rear of the sidewise extending members, a universal connection between the Hoating bar and each sidewise extending member, a control bar in the forward portion of the machine, a pivotal connection between each end of the contro-l bar and the floating bar, an adjustable counter-balance on the floating bar, a tracing point on the control bar, a suitable carving tool on the control bar, and means for driving said carving tool in any adjusted position of the control bar, for the 'purpose specified.

l0. In a carving machine, the combination with a suitable framework, of a pair of sidewise extending members, a pivotal connection for each of said members whereby the same is enabled to swing about a vertical axis, a floating bar to the rear of the sidewise extending members, a universal connection between the floating bar and each sidewise extending member, means for retaining the floating bar against lateral displacement while permitting each point on said floating bar to move freely within a vertical plane, an adjustable counter-balance on the floating bar, a control bar in the forward portion of the machine, a pivoted connection between each end of the control bar and the floating bar, whereby the control bar is enabled to move laterally with respect to the floating bar while remaining parallel to the floating bar, a tracing point on the control bar, a suitable carving tool on the control bar, .and means for driving said carving tool in any adjusted position of the control bar, for the purpose specied.

11. In a carving machine, the combination with a suitable framework, of a pair of sidewise extending members, a pivotal mounting for each of said members whereby the same is enabled to swing about a vertical axis, a floating bar behind the said members, a universal connection between the floating bar and each of said members, a control bar in the forward portion of the machine, a pivotal connection between each end of the control bar and the floating bar, whereby the control bar is enabled to move able`carv1ng means' for driving saidV carving tool 111 any laterally l'with respect to ,the floating bar,

While remaining parallel to the floating bar, j

a tracing'point on the control bar,

' tool" on the control bar,

1Q. In a'carvmg machine, the combination with-` a suitable frame-Work, of a pair of y'sidewise extending members, a pivotal connection lbetvveen'each sidevvise extending member and the frame-Work, 'whereby 'each of saidA members 1s permitted to swing about a vertical-.- axis,'fa floating'fbar, a universaly connectionbetvveenthe floating bar and 'each 'sidewise extending member, a control *bar in the lforvvardl p'ortion'of the machine', 'a

pivotalconnection between Veach-4 end of the:l 'the -floating'bar, a tracing control bar and point' on the control bar, a suitable carving tool on the control bar, and means for driving said carving tool in any adjusted position of the control 'bar,ifor the purpose specified.

13. In a carving machine, the combination 'with Ia suitable frame-Work, of a pair of members', 'each member being pivoted on a yvertical axis,L a iioatingbar, a universal connection between the floating bar and each of said' members, aV control bara pivotal connection between each end of the control bar and tliefloating bar, a suitablevv carving tool 'on the control bar, and "means for driving saidcarving tool in any adjusted 'position of the' control bar, lfor'tlne purpose specified. p i JOHN GALBRAITH. l

VVi'tnesses: 1 v

W. S. KENNEDY,

E. E. HEATH,

Copies of'this'pate'nt may be ,obtainedk for ve centseacm by addressing the Commissioner of Patents,

Washington, D: C1. 

